body, html {
    height: 100%;
    margin: 0;
    transition: opacity 1s ease-in-out;
    font-family: 'Roboto', sans-serif; 
    background: radial-gradient(ellipse at bottom, #1C1C1C 0%, #000 100%); 
    color: #fff;
    line-height: 1.6;
}
@keyframes fade {
    0% {
      opacity: 0;
    }
    100% {
      opacity: 1;
    }
  }
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    text-align: center;
}
.chapter-content {
    background: rgba(255, 255, 255, 0.1);
    padding: 40px;
    margin-top: 50px;
    max-height: 400px;
    animation: fade 1.5s ease-in-out;
    overflow-y: scroll;
    border-radius: 8px;
    box-shadow: 0 10px 20px rgba(255, 255, 255, 0.2);
}
h1 {
    font-size: 2.5em;
    margin-bottom: 0.5em;
}
p {
    font-size: 1em;
}
.navigation-buttons {
    margin-top: 30px;
}
a {
    color: #00BFFF; 
    transition: color 0.3s;
    text-decoration: none;
    padding: 10px 15px;
    border: 1px solid #00BFFF;
    border-radius: 5px;
    margin: 0 10px;
}
a:hover, a:focus {
    color: #fff;
    background-color: #00BFFF;
    outline: none;
}
.stars {
    width: 100%;
    height: 100%;
    position: fixed;
    opacity: 0.2;
    top: 0;
    left: 0;
    z-index: -1;
}
.chapter-content::-webkit-scrollbar {
    width: 12px;
}

.chapter-content::-webkit-scrollbar-track {
    background: #f1f1f1;
}

.chapter-content::-webkit-scrollbar-thumb {
    background: #888; 
    border-radius: 10px; 
}

.chapter-content::-webkit-scrollbar-thumb:hover {
    background: #555; 
}